Forked Lightning

Cost: 16 Arcane Power
Hurl a barrage of arcane projectiles that deal 400% weapon damage as Arcane to all enemies near the impact location.
Arcane Torrent damage is increased by 305% weapon damage every second, up to a maximum total of 1010% weapon damage as Arcane.

Flame Ward

You take 15% less damage from attacks while channeling. Every second you channel increases this amount by 5%, up to a maximum total of 25% damage reduction.
Arcane Torrent's damage turns into Fire.

Cost: 40 Arcane Power
Summon an immense Meteor that plummets from the sky, crashing into enemies for 740% weapon damage as Fire. The ground it hits is scorched with molten fire that deals 235% weapon damage as Fire over 3 seconds.

Star Pact

Expend all remaining Arcane Power. Each point of extra Arcane Power spent increases the impact damage of Meteor by 20% weapon damage as Arcane.

Damaging enemies with Arcane, Cold, Fire or Lightning will cause them to take 5% more damage from your attacks for 5 seconds. Each different damage type applies a stack, stacking up to 4 times.
Elemental damage from your weapon contributes to Elemental Exposure.